M4 Exhaust Slip-On System with Black GP Canister - KA9722-GP mirrors the metal plate in the

the metal plate in the middle creates a low pressure zone directly underneath it causing the Air velocity through the filter to increase

Let the new 4SR Racing Power AR suit do the talking for you - As this suit states in print

Adjusters for compression and rebound

Harley-Davidson Road King Classic FLHRC (FL3) (2014 – 2016)

The rider’s safety is always our top priority

M4 Exhaust Slip-On System with Black GP Canister - KA9722-GP mirrors the metal plate in theStainless steel GP style canister ceramic coated black. 7. 3 horsepower over stock! Removes stock exhaust valve. Stage 1 quiet insert comes pre installed while the stage 2 quiet insert is optional. Stage 1 Q1 Quiet Insert Installed Q3 Stage 2 Quiet Insert Sold Separate